Chop the fennel into thin matchsticks or shred into very thin slices. Keep some of the leaves and chop (if the fennel didn't have any leaves - don't worry!)Peel and de core the apples then cut into thin slices. Cut the thin slices into very fine matchsticks then squeeze over half of the lemon and mix well.Very finely slice the red onion and add a little lemon over, mix well.Now combine all the ingredients in a bowl. That's IT!